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Your search keyword '"Viškelis, Jonas"' showing total 3 results
Start Over Author "Viškelis, Jonas" Topic food quality
3 results on '"Viškelis, Jonas"'

1. Determination of tomato quality attributes using near infrared spectroscopy and reference analysis.

Author

RADZEVIČIUS, Audrius, VIŠKELIS, Jonas, KARKLELIENĖ, Rasa, JUŠKEVIČIENĖ, Danguolė, and VIŠKELIS, Pranas

Subjects
*FOOD quality, *TOMATOES, *FRUIT skins, *PLANT chemical analysis, *REGRESSION analysis, *NEAR infrared spectroscopy
Abstract

The research objective was determination of ripening attributes of intact tomato (Lycopersicon esculentum Mill.) cv. 'Rutuliai' using near infrared (NIR) spectroscopy and reference analysis. Tomatoes were picked at six different ripening stages in order to evaluate the correlation between data obtained by near infrared spectra and physicalchemical analyses and how the quality parameters change during ripening. Primarily, spectroscopic measurements were followed by chemical analyses. NIR spectroscopy measurements and reference analyses showed that tomato fruit had lost skin and flesh firmness during the ripening processes and there were no big differences between the methods used for the determination of dry matter and soluble solids (°Brix) and the obtained results varied slightly. The obtained results of dry matter, soluble solids content (°Brix) and fruit skin and flesh firmness were presented as simple linear regression between NIR spectroscopy and reference analyses. A high correlation between NIR spectroscopy and reference analyses of dry matter was established and this correlation, expressed by regression coefficient, reached 0.9089. Regression coefficient between NIR spectroscopy and reference analyses of soluble solids was 0.815. Meanwhile, the highest correlation was detected for tomato fruit skin and flesh firmness and regression coefficient, respectively, reached 0.9119 and 0.9624. Hence the near infrared calibration has the potential to estimate the physical-chemical properties of tomato fruit according to their infrared spectra. [ABSTRACT FROM AUTHOR]

Published
2016
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2. Farming Systems Influence on Tomato Fruit Quality.

Author

Radzevičius, Audrius, Viškelis, Pranas, Viškelis, Jonas, Rubinskienė, Marina, Karklelienė, Rasa, and Juškevičienė, Danguolė

Subjects
FRUIT quality, FOOD quality, TOMATOES, AGRICULTURE, LYCOPENE, ORGANIC farming
Abstract

Investigation was carried out at the Institute of Horticulture Lithuanian Research Centre for Agriculture and Forestry. Tomatoes were growth using two different farming systems (organic and conventional) in no heated greenhouses in the natural soil. The study object was tomato cultivar 'Vilina' and two tomato hybrids 'Benito' and 'Tolstoi'. Tomato fruit quality and physiological parameters were evaluated: there was established the amount of dry matter, soluble solids, lycopene and β-carotene, also skin and flesh firmness and color coordinates (CIE L*, a*, b*, C, h°). Our research showed that higher dry matter and soluble solids content was found in organically growth tomato of all investigated cultivars compared with conventional growth tomato, but determined differences were not statistically significant. An average amount of lycopene in organic fruits was significant higher compared with conventional ones. A comparison of β-carotene in organic and conventional tomato showed that significant higher amount was established only in organic fruits of hybrid 'Tolstoi'. Average data of fruit firmness revealed that conventional tomato fruits had stronger skin and flesh compared with organic ones, but difference was not significant. It was established significant increase in tomato fruit color tone (by 4.78 units) and pureness (by 2.46 units) in conventional tomato, meanwhile organic tomato fruits distinguished with significant higher value of color index a* (redness) by 4.18 units. [ABSTRACT FROM AUTHOR]

Published
2013

3. Sėjos laiko įtaka pomidorų veislės 'Tamina' derliui ir jo kokybei.

Author

Radzevičius, Audrius, Viškelis, Pranas, Viškelis, Jonas, Rubinskienė, Marina, Karklelienė, Rasa, Maročkienė, Nijolė, and Juškevičienė, Danguolė

Subjects
*TOMATO varieties, *SOWING, *FOOD quality, *TOMATOES, *SEEDLINGS, *HORTICULTURE, *POLYETHYLENE, *NEAR infrared spectroscopy
Abstract

Investigation was carried out at the LRCAF Institute of Horticulture in 2012. The aim of this experiment was to evaluate delayed sowing time influence on tomato yield and quality. The object of investigation was tomato variety -- 'Tamina'. It's a medium early, indeterminate type variety, growing up till 2 meters in height with mid-sized (75 g) fruits. Tomato seeds were sown at four different times (29-03-2012; 05-04-2012; 04-12-2012 and 19-04-2012) in heated greenhouse. On the 5th of June tomato seedlings were planted in natural soil in polyethylene non-heated greenhouse as a second culture. The experiment was conducted in three replications. Harvesting field area was 2.1 m². Dry matter and soluble solids content of tomato fruit were determined at the LRCAF Institute of Horticulture in Biochemistry and Technology Laboratory, applying non-destructive Near Infrared Spectroscopy (NIR). The results showed that the earliest sown tomatoes had the earliest yield, but time between germination and the first yield was 3 days longer in comparison with latest sowing tomatoes. Tomatoes sown on the 29th of March and on the 5th of April stood out with the highest total and marketable yields. Tomato sowing time delay gradually increased the amount of non-marketable yield and non-marketable amount of fruits. The earliest sown tomatoes had the largest fruits and sowing delay had negative effect on fruit size. Sowing time also influenced the amounts of dry soluble solids and soluble solids content in tomato fruits. [ABSTRACT FROM AUTHOR]

Published
2012

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